package com.aacar.utils;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.springframework.beans.BeanUtils;

public class BeanUtil {

	public static void copyProperties(Object source, Object target){
		if (source!=null && target!=null){
			BeanUtils.copyProperties(source,target);
		}
	}
	  
	/**
	 * 转换paramMap
	 * @param paramMap
	 * @return
	 */
	public static Map<String,String> converRequestParamMap(Map paramMap){
		    Map<String,String> resMap = new HashMap<String,String>();  
		    Map<String, String[]> map = paramMap;  
	        Set<Entry<String, String[]>> set = map.entrySet();  
	        Iterator<Entry<String, String[]>> it = set.iterator();  
	        while (it.hasNext()) {  
	            Entry<String, String[]> entry = it.next();  
	            for (String i : entry.getValue()) {  
	            	resMap.put(entry.getKey(), i);
	            }  
	        } 
	        return resMap;
	}
	
    /**
     * 将一个 Map 对象转化为一个 JavaBean
     * @param type 要转化的类型
     * @param map 包含属性值的 map
     * @return 转化出来的 JavaBean 对象
     * @throws IntrospectionException
     *             如果分析类属性失败
     * @throws IllegalAccessException
     *             如果实例化 JavaBean 失败
     * @throws InstantiationException
     *             如果实例化 JavaBean 失败
     * @throws InvocationTargetException
     *             如果调用属性的 setter 方法失败
     */
    public static Object convertMap(Class type, Map map)
            throws IntrospectionException, IllegalAccessException,
            InstantiationException, InvocationTargetException {
        BeanInfo beanInfo = Introspector.getBeanInfo(type); // 获取类属性
        Object obj = type.newInstance(); // 创建 JavaBean 对象

        // 给 JavaBean 对象的属性赋值
        PropertyDescriptor[] propertyDescriptors =  beanInfo.getPropertyDescriptors();
        for (int i = 0; i< propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();

            if (map.containsKey(propertyName)) {
                // 下面一句可以 try 起来，这样当一个属性赋值失败的时候就不会影响其他属性赋值。
                Object value = map.get(propertyName);

                Object[] args = new Object[1];
                args[0] = value;

                descriptor.getWriteMethod().invoke(obj, args);
            }
        }
        return obj;
    }

    /**
     * 将一个 JavaBean 对象转化为一个  Map
     * @param bean 要转化的JavaBean 对象
     * @return 转化出来的  Map 对象
     * @throws IntrospectionException 如果分析类属性失败
     * @throws IllegalAccessException 如果实例化 JavaBean 失败
     * @throws InvocationTargetException 如果调用属性的 setter 方法失败
     */
    public static Map convertBean(Object bean){
        try {
			Class type = bean.getClass();
			Map returnMap = new HashMap();
			BeanInfo beanInfo = Introspector.getBeanInfo(type);

			PropertyDescriptor[] propertyDescriptors =  beanInfo.getPropertyDescriptors();
			for (int i = 0; i< propertyDescriptors.length; i++) {
			    PropertyDescriptor descriptor = propertyDescriptors[i];
			    String propertyName = descriptor.getName();
			    if (!propertyName.equals("class")) {
			        Method readMethod = descriptor.getReadMethod();
			        Object result = readMethod.invoke(bean, new Object[0]);
			        if (result != null) {
			            returnMap.put(propertyName, result);
			        } else {
			            returnMap.put(propertyName, "");
			        }
			    }
			}
			return returnMap;
		} catch (Exception e) {
			//e.printStackTrace();
		}
		return new HashMap();
    }
    
    public static List<?> copyList (List <? extends Object> poList , Class voClass){
        List voList=new ArrayList();
        Object voObj =null;
        for(Object poObj:poList){
            try {
                voObj = voClass.newInstance();
            } catch (Exception e) {
                e.printStackTrace();
            }
            BeanUtils.copyProperties(poObj, voObj);
            voList.add(voObj);
        }
        return voList;
         
    }
} 